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I am quite interested in adding Hill Sprints to my training but I've read conflicting views. I already take in a few hills when I'm out running but I want to build up some real power when going up them and also improve my VO2 max. Some articles don't really give a timescale of when you should start to incorporate them, I read somewhere 8 weeks of running is advisbale before proceeding with them. Also, the length of the hill seems to vary - a hill that takes about 30 seconds to scale or some articles state 60 seconds and some don't specify. What works?